1 Entering the entire DynDNS domain name

In the "Domain name" field, enter the complete domain name, for example mydomain.dyndns.com. Refer to the dynamic DNS provider for information on the format.

Click "Apply" to save the settings.

2 DNS servers on the internet were not updated yet

Some DNS servers on the internet do not immediately update the assignment of IP addresses to domain names. This means that they continue to reply to requests to dynamic DNS domain names with an old IP address for a while, although the FRITZ!Box already reported the new IP address to your dynamic DNS provider. This behavior of the DNS servers cannot be influenced by the FRITZ!Box or your dynamic DNS provider.

Normally the issue will resolve itself after a maximum of one hour, when the corresponding DNS servers on the internet are updated.